PONGSTHORN , C., OZAWA , H., AIZAWA , T., KUSAKABE , T., NAKAMURA , T. and ITOI , E. 2009. Giant sacral schwannoma: A report of six cases. Upsala Journal of Medical Sciences. 115, 2 (Nov. 2009), 146–152. DOI:https://doi.org/10.3109/03009730903359674.